Volume 18, Number 5—May 2012
Research
Antimicrobial Drug Resistance in Escherichia coli from Humans and Food Animals, United States, 1950–2002
Daniel A. Tadesse, Shaohua Zhao, Emily Tong, Sherry Ayers, Aparna Singh, Mary J. Bartholomew, and Patrick F. McDermott
Table 3
Multiple antimicrobial drug resistance among Escherichia coli isolates analyzed by source, United States, 1950–2002
| No. drug classes to which isolates are resistant | % Resistant |
||||
|---|---|---|---|---|---|
| Human, n = 983 | Animal |
Total, n = 1,729 | |||
| Cattle, n = 323 | Chickens, n =138 | Pigs, n = 285 | |||
| 0* | 64.8 | 21.4 | 21.0 | 21.1 | 46 |
| 1 | 12.4 | 9 | 7.2 | 9.1 | 10.8 |
| 2 | 7.5 | 10.5 | 16.7 | 16.1 | 10.2 |
| 3 | 6.5 | 22.6 | 26.8 | 23.9 | 14 |
| 4 | 4.5 | 15.5 | 14.5 | 13.3 | 8.8 |
| 5 | 3.8 | 7.7 | 7.2 | 8.4 | 5.5 |
| 6 | 0.4 | 6.2 | 4.3 | 2.8 | 2.2 |
| 7 | 0.1 | 5.3 | 2.2 | 5.3 | 2.1 |
| 8 | 0 | 1.9 | 0 | 0 | 0.3 |
*Susceptible to all drug classes.
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